Gemstone



FIG. 1 is a front perspective view of a gemstone showing my new design;

FIG. 2 is a left side elevational view thereof, the right side being identical;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a top plan view of an obvious variant thereof. 

The ornamental design for a gemstone, as shown and described. 